'\" te
.\" Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
.\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.TH NVLIST_LOOKUP_BOOLEAN 9F "September 12, 2020"
.SH NAME
nvlist_lookup_boolean, nvlist_lookup_boolean_value, nvlist_lookup_byte,
nvlist_lookup_int8, nvlist_lookup_int16, nvlist_lookup_int32,
nvlist_lookup_int64, nvlist_lookup_uint8, nvlist_lookup_uint16,
nvlist_lookup_uint32, nvlist_lookup_uint64, nvlist_lookup_string,
nvlist_lookup_nvlist, nvlist_lookup_boolean_array, nvlist_lookup_byte_array,
nvlist_lookup_int8_array, nvlist_lookup_int16_array, nvlist_lookup_int32_array,
nvlist_lookup_int64_array, nvlist_lookup_uint8_array,
nvlist_lookup_uint16_array, nvlist_lookup_uint32_array,
nvlist_lookup_uint64_array, nvlist_lookup_string_array,
nvlist_lookup_nvlist_array, nvlist_lookup_pairs \- match name and type
indicated by the interface name and retrieve data value
.SH SYNOPSIS
.nf
#include <sys/nvpair.h>

\fBint\fR \fBnvlist_lookup_boolean\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_boolean_value\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBboolean_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_byte\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuchar_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int8\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint8_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint8\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint8_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int16\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint16_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint16\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint16_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int32\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint32_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint32\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint32_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int64\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint64_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint64\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint64_t *\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_string\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBchar **\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_nvlist\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBnvlist_t **\fR\fIval\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_boolean_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBboolean_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_byte_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuchar_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int8_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint8_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint8_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint8_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int16_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint16_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint16_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint16_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int32_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint32_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint32_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint32_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_int64_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBint64_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_uint64_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBuint64_t **\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_string_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBchar  ***\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_nvlist_array\fR(\fBnvlist_t *\fR\fInvl\fR, \fBconst char *\fR\fIname\fR,
     \fBnvlist_t ***\fR\fIval\fR, \fBuint_t *\fR\fInelem\fR);
.fi

.LP
.nf
\fBint\fR \fBnvlist_lookup_pairs\fR(\fBnvlist_t *\fR\fInvl\fR, \fBint\fR \fIflag, ...\fR);
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI)
.SH PARAMETERS
.ne 2
.na
\fB\fInvl\fR\fR
.ad
.RS 9n
The list of name-value pairs (\fBnvlist_t\fR) to be processed.
.RE

.sp
.ne 2
.na
\fB\fIname\fR\fR
.ad
.RS 9n
Name of the name-value pair (\fBnvpair\fR) to search.
.RE

.sp
.ne 2
.na
\fB\fInelem\fR\fR
.ad
.RS 9n
Address to store the number of elements in value.
.RE

.sp
.ne 2
.na
\fB\fIval\fR\fR
.ad
.RS 9n
Address to store the value or starting address of the array value.
.RE

.sp
.ne 2
.na
\fB\fIflag\fR\fR
.ad
.RS 9n
Specify bit fields defining lookup behavior:
.sp
.ne 2
.na
\fBNV_FLAG_NOENTOK\fR
.ad
.RS 19n
The retrieval function will not fail if no matching name-value pair is found.
.RE

.RE

.SH DESCRIPTION
These functions find the \fBnvpair\fR that matches the name and type as
indicated by the interface name. If one is found, \fInelem\fR and \fIval\fR are
modified to contain the number of elements in value and the starting address of
data, respectively.
.sp
.LP
These interfaces work for \fBnvlist_t\fR allocated with \fBNV_UNIQUE_NAME\fR or
\fBNV_UNIQUE_NAME_TYPE\fR specified in \fBnvlist_alloc()\fR. See
\fBnvlist_alloc\fR(9F). If this is not the case, the interface will return
\fBENOTSUP\fR because the list potentially contains multiple \fBnvpair\fRs with
the same name and type.
.sp
.LP
Multiple threads can simultaneously read the same \fBnvlist_t\fR but only one
thread should actively change a given \fBnvlist_t\fR at a time. The caller is
responsible for the synchronization.
.sp
.LP
All memory required for storing the array elements, including string values,
are managed by the library. References to such data remain valid until
\fBnvlist_free()\fR is called on \fInvl\fR.
.sp
.LP
The \fBnvlist_lookup_pairs()\fR function retrieves a set of \fBnvpair\fRs. The
arguments are a null-terminated list of pairs (data type
\fBDATA_TYPE_BOOLEAN\fR), triples (non-array data types) or quads (array data
types). As shown below, the interpretation of the arguments depends on the
value of \fItype\fR. See \fBnvpair_type\fR(9F).
.sp
.ne 2
.na
\fB\fIname\fR\fR
.ad
.RS 9n
Name of the name-value pair to search.
.RE

.sp
.ne 2
.na
\fB\fItype\fR\fR
.ad
.RS 9n
Data type.
.RE

.sp
.ne 2
.na
\fB\fIval\fR\fR
.ad
.RS 9n
Address to store the starting address of the value. When using data type
\fBDATA_TYPE_BOOLEAN\fR, the \fIval\fR argument is ignored.
.RE

.sp
.ne 2
.na
\fB\fInelem\fR\fR
.ad
.RS 9n
Address to store the number of elements in value. Non-array data types have
only one argument and \fInelem\fR is ignored.
.RE

.sp
.LP
The argument order is \fIname\fR, \fItype\fR, [\fIval\fR], [\fInelem\fR].
.sp
.LP
When using \fBNV_FLAG_NOENTOK\fR and no matching name-value pair is found, the
memory pointed to by \fIval\fR and \fInelem\fR is not touched.
.sp
.LP
These functions return \fB0\fR on success and an error value on failure.
.SH ERRORS
These functions fail under the following conditions.
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 11n
Success.
.RE

.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 11n
Invalid argument.
.RE

.sp
.ne 2
.na
\fB\fBENOENT\fR\fR
.ad
.RS 11n
No matching name-value pair found.
.RE

.sp
.ne 2
.na
\fB\fBENOTSUP\fR\fR
.ad
.RS 11n
Encode/decode method not supported.
.RE

.SH CONTEXT
These functions can be called from user, interrupt, or kernel context.
.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
.TE

.SH SEE ALSO
.BR nvlist_alloc (9F),
.BR nvpair_type (9F)
.sp
.LP
\fIWriting Device Drivers\fR
.sp
.LP
\fISTREAMS Programming Guide\fR
